StatTutor Lesson - The Problem of Multiple Comparisons

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The problem of multiple comparisons
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      Question 1

      71

      Question 1.

      How many two-sample proportion z tests are required to compare three population proportions?

      		A.
      		B.
      		C.
      		D.
      Correct. Three separate two-sample proportion tests are required to compare three proportions.
      Incorrect. Three separate two-sample proportion tests are required to compare three proportions.
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      Question 2

      119

      Question 2.

      Which of the following is NOT a problem with multiple comparisons?

      		A.
      		B.
      		C.
      		D.
      Correct. Stating one hypothesis and knowing which P-value to use, how to interpret them and use them are all problems with multiple comparisons. You can, however, use the same level of significance for all of the tests.
      Incorrect. Stating one hypothesis and knowing which P-value to use, how to interpret them and use them are all problems with multiple comparisons. You can, however, use the same level of significance for all of the tests.
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      Question 3

      202

      Question 3.

      What is the name of the test that compares multiple proportions?

      		A.
      		B.
      		C.
      Correct. We use a chi-square test to compare three or more proportions.
      Incorrect. We use a chi-square test to compare three or more proportions.
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